University Admission Chemistry Exam
Question 1 of 30
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Which statement best explains why solid sodium chloride conducts electricity when molten but not when solid?
Select one option.
A
In the solid lattice, ions are fixed; in the molten state, ions are mobile and carry charge.
B
Solid sodium chloride contains free electrons that move only when heated.
C
Molten sodium chloride becomes covalent, allowing electrons to flow.
D
In the solid, chloride ions are neutral; in the molten state, they become charged.
E
The melting process creates protons that act as charge carriers.
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